大型锻钢支承辊工频淬火新工艺探索

Exploration on new power frequency quenching procedure of large scale forged backup roll

针对带钢冷轧连退、热镀锌、平整机支承辊及有色金属冷轧机大直径支承辊采用传统热处理工艺,淬火层深度达不到技术要求的问题,对大型锻钢支承辊采用工频连续感应加热+喷水冷却淬火新工艺,热处理后,辊身硬度达69～76HSD;淬火层深度≥50 mm,比原工艺提高了40%,机械性能满足设计要求。

Since the strip steel cold rolling backup roll, hot dip galvanizing, planisher backup roll and major diameter backup roll of non-ferrous cool-rolling mill have adopted the traditional heat treatment process, the depth of their quenching layers cannot meet the technical requirements. The heat treatment of the line frequency continuous induction heating and spray water cooling quenching process makes the hardness of the large-scale forged backup roll reach 69 -76 HSD and the depth of quenching layer ≥50 mm, which is 140% as deep as that of the original quenching layers, and mechanical behavior meets the design requirements.